Over the years I've owned and sold a Novation Nova Desktop, RM1x, Korg ESX-SX1, Virus T1 v1 - and I think that was it, in terms of hardware synthsesis and sequencing (still got an ESi-32 w/zip drive (!), a Bitstream 3x and a herd of softsynths)

After a few years of softsynths - and losing track of hardware releases due to focus on other matters away from the studio (I was shocked to discover life on the outside), I would like to return to an all in one sequencing hardware synth, pref. with sampling/sample import capability.

The OP-1 has sequencers and sampling capability (6 seconds on a sound that is pitched up and down the keyboard, 12 seconds on the drum oriented sampler). You can also sample sounds from FM radio, and have 4 6 minute tracks on the Tape. Makes resampling for wild sounds pretty easy.

Neither has "loads of modulation" though. The OP-1 has a single envelope and single LFO, the MicroBrute the same (with a patchable mod matrix).

Tbh, an Octatrack with single cycle waves (or zooming in to one in whatever samples you like) is really hard to beat for what you're wanting.